I'm NOT the one arguing for open carry. In fact, if I would have my way, nobody should have any guns without a thorough background check, limited in type, and only in a person's home, or for hunting. That is, however, NOT what either Texas or for that matter the Supreme Court thinks. They think I'm worse than the devil for even suggesting limitations on guns. So not only is it lawful. It's wholeheartedly supported by as far as I can tell, most people on the right.
As for the lawfulness of pardons. They are. And if done for the right reasons even good. This however is a governor of a state openly stating that his OPINION overrides a jury verdict because he didn't like that verdict. So no, I don't think the division is about lawful. It's about ethical. And in my book about the precedent.
In this case a precedent that is so rawly political it's disgusting and an ABUSE of that power.